diff --git a/Documentation/power/freezing-of-tasks.txt b/Documentation/power/freezing-of-tasks.txt
new file mode 100644
index 0000000000000000000000000000000000000000..af1a282c71a3135e0e0c7999c6db280dde74766a
--- /dev/null
+++ b/Documentation/power/freezing-of-tasks.txt
@@ -0,0 +1,160 @@
+Freezing of tasks
+ (C) 2007 Rafael J. Wysocki <rjw@sisk.pl>, GPL
+
+I. What is the freezing of tasks?
+
+The freezing of tasks is a mechanism by which user space processes and some
+kernel threads are controlled during hibernation or system-wide suspend (on some
+architectures).
+
+II. How does it work?
+
+There are four per-task flags used for that, PF_NOFREEZE, PF_FROZEN, TIF_FREEZE
+and PF_FREEZER_SKIP (the last one is auxiliary). The tasks that have
+PF_NOFREEZE unset (all user space processes and some kernel threads) are
+regarded as 'freezable' and treated in a special way before the system enters a
+suspend state as well as before a hibernation image is created (in what follows
+we only consider hibernation, but the description also applies to suspend).
+
+Namely, as the first step of the hibernation procedure the function
+freeze_processes() (defined in kernel/power/process.c) is called. It executes
+try_to_freeze_tasks() that sets TIF_FREEZE for all of the freezable tasks and
+sends a fake signal to each of them. A task that receives such a signal and has
+TIF_FREEZE set, should react to it by calling the refrigerator() function
+(defined in kernel/power/process.c), which sets the task's PF_FROZEN flag,
+changes its state to TASK_UNINTERRUPTIBLE and makes it loop until PF_FROZEN is
+cleared for it. Then, we say that the task is 'frozen' and therefore the set of
+functions handling this mechanism is called 'the freezer' (these functions are
+defined in kernel/power/process.c and include/linux/freezer.h). User space
+processes are generally frozen before kernel threads.
+
+It is not recommended to call refrigerator() directly. Instead, it is
+recommended to use the try_to_freeze() function (defined in
+include/linux/freezer.h), that checks the task's TIF_FREEZE flag and makes the
+task enter refrigerator() if the flag is set.
+
+For user space processes try_to_freeze() is called automatically from the
+signal-handling code, but the freezable kernel threads need to call it
+explicitly in suitable places. The code to do this may look like the following:
+
+ do {
+ hub_events();
+ wait_event_interruptible(khubd_wait,
+ !list_empty(&hub_event_list));
+ try_to_freeze();
+ } while (!signal_pending(current));
+
+(from drivers/usb/core/hub.c::hub_thread()).
+
+If a freezable kernel thread fails to call try_to_freeze() after the freezer has
+set TIF_FREEZE for it, the freezing of tasks will fail and the entire
+hibernation operation will be cancelled. For this reason, freezable kernel
+threads must call try_to_freeze() somewhere.
+
+After the system memory state has been restored from a hibernation image and
+devices have been reinitialized, the function thaw_processes() is called in
+order to clear the PF_FROZEN flag for each frozen task. Then, the tasks that
+have been frozen leave refrigerator() and continue running.
+
+III. Which kernel threads are freezable?
+
+Kernel threads are not freezable by default. However, a kernel thread may clear
+PF_NOFREEZE for itself by calling set_freezable() (the resetting of PF_NOFREEZE
+directly is strongly discouraged). From this point it is regarded as freezable
+and must call try_to_freeze() in a suitable place.
+
+IV. Why do we do that?
+
+Generally speaking, there is a couple of reasons to use the freezing of tasks:
+
+1. The principal reason is to prevent filesystems from being damaged after
+hibernation. At the moment we have no simple means of checkpointing
+filesystems, so if there are any modifications made to filesystem data and/or
+metadata on disks, we cannot bring them back to the state from before the
+modifications. At the same time each hibernation image contains some
+filesystem-related information that must be consistent with the state of the
+on-disk data and metadata after the system memory state has been restored from
+the image (otherwise the filesystems will be damaged in a nasty way, usually
+making them almost impossible to repair). We therefore freeze tasks that might
+cause the on-disk filesystems' data and metadata to be modified after the
+hibernation image has been created and before the system is finally powered off.
+The majority of these are user space processes, but if any of the kernel threads
+may cause something like this to happen, they have to be freezable.
+
+2. The second reason is to prevent user space processes and some kernel threads
+from interfering with the suspending and resuming of devices. A user space
+process running on a second CPU while we are suspending devices may, for
+example, be troublesome and without the freezing of tasks we would need some
+safeguards against race conditions that might occur in such a case.
+
+Although Linus Torvalds doesn't like the freezing of tasks, he said this in one
+of the discussions on LKML (http://lkml.org/lkml/2007/4/27/608):
+
+"RJW:> Why we freeze tasks at all or why we freeze kernel threads?
+
+Linus: In many ways, 'at all'.
+
+I _do_ realize the IO request queue issues, and that we cannot actually do
+s2ram with some devices in the middle of a DMA. So we want to be able to
+avoid *that*, there's no question about that. And I suspect that stopping
+user threads and then waiting for a sync is practically one of the easier
+ways to do so.
+
+So in practice, the 'at all' may become a 'why freeze kernel threads?' and
+freezing user threads I don't find really objectionable."
+
+Still, there are kernel threads that may want to be freezable. For example, if
+a kernel that belongs to a device driver accesses the device directly, it in
+principle needs to know when the device is suspended, so that it doesn't try to
+access it at that time. However, if the kernel thread is freezable, it will be
+frozen before the driver's .suspend() callback is executed and it will be
+thawed after the driver's .resume() callback has run, so it won't be accessing
+the device while it's suspended.
+
+3. Another reason for freezing tasks is to prevent user space processes from
+realizing that hibernation (or suspend) operation takes place. Ideally, user
+space processes should not notice that such a system-wide operation has occurred
+and should continue running without any problems after the restore (or resume
+from suspend). Unfortunately, in the most general case this is quite difficult
+to achieve without the freezing of tasks. Consider, for example, a process
+that depends on all CPUs being online while it's running. Since we need to
+disable nonboot CPUs during the hibernation, if this process is not frozen, it
+may notice that the number of CPUs has changed and may start to work incorrectly
+because of that.
+
+V. Are there any problems related to the freezing of tasks?
+
+Yes, there are.
+
+First of all, the freezing of kernel threads may be tricky if they depend one
+on another. For example, if kernel thread A waits for a completion (in the
+TASK_UNINTERRUPTIBLE state) that needs to be done by freezable kernel thread B
+and B is frozen in the meantime, then A will be blocked until B is thawed, which
+may be undesirable. That's why kernel threads are not freezable by default.
+
+Second, there are the following two problems related to the freezing of user
+space processes:
+1. Putting processes into an uninterruptible sleep distorts the load average.
+2. Now that we have FUSE, plus the framework for doing device drivers in
+userspace, it gets even more complicated because some userspace processes are
+now doing the sorts of things that kernel threads do
+(https://lists.linux-foundation.org/pipermail/linux-pm/2007-May/012309.html).
+
+The problem 1. seems to be fixable, although it hasn't been fixed so far. The
+other one is more serious, but it seems that we can work around it by using
+hibernation (and suspend) notifiers (in that case, though, we won't be able to
+avoid the realization by the user space processes that the hibernation is taking
+place).
+
+There are also problems that the freezing of tasks tends to expose, although
+they are not directly related to it. For example, if request_firmware() is
+called from a device driver's .resume() routine, it will timeout and eventually
+fail, because the user land process that should respond to the request is frozen
+at this point. So, seemingly, the failure is due to the freezing of tasks.
+Suppose, however, that the firmware file is located on a filesystem accessible
+only through another device that hasn't been resumed yet. In that case,
+request_firmware() will fail regardless of whether or not the freezing of tasks
+is used. Consequently, the problem is not really related to the freezing of
+tasks, since it generally exists anyway. [The solution to this particular
+problem is to keep the firmware in memory after it's loaded for the first time
+and upload if from memory to the device whenever necessary.]
diff --git a/Documentation/power/kernel_threads.txt b/Documentation/power/kernel_threads.txt
deleted file mode 100644
index fb57784986b1fcdee6b76048fb9c9703939bc849..0000000000000000000000000000000000000000
--- a/Documentation/power/kernel_threads.txt
+++ /dev/null
@@ -1,40 +0,0 @@
-KERNEL THREADS
-
-
-Freezer
-
-Upon entering a suspended state the system will freeze all
-tasks. This is done by delivering pseudosignals. This affects
-kernel threads, too. To successfully freeze a kernel thread
-the thread has to check for the pseudosignal and enter the
-refrigerator. Code to do this looks like this:
-
- do {
- hub_events();
- wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
- try_to_freeze();
- } while (!signal_pending(current));
-
-from drivers/usb/core/hub.c::hub_thread()
-
-
-The Unfreezable
-
-Some kernel threads however, must not be frozen. The kernel must
-be able to finish pending IO operations and later on be able to
-write the memory image to disk. Kernel threads needed to do IO
-must stay awake. Such threads must mark themselves unfreezable
-like this:
-
- /*
- * This thread doesn't need any user-level access,
- * so get rid of all our resources.
- */
- daemonize("usb-storage");
-
- current->flags |= PF_NOFREEZE;
-
-from drivers/usb/storage/usb.c::usb_stor_control_thread()
-
-Such drivers are themselves responsible for staying quiet during
-the actual snapshotting.
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index 152b510d1bbb5560945e3550c9b0276f7aa452ab..aea7e920966753193c6139d84e7839f7de485ebe 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -140,21 +140,11 @@ should be sent to the mailing list available through the suspend2
website, and not to the Linux Kernel Mailing List. We are working
toward merging suspend2 into the mainline kernel.
-Q: A kernel thread must voluntarily freeze itself (call 'refrigerator').
-I found some kernel threads that don't do it, and they don't freeze
-so the system can't sleep. Is this a known behavior?
-
-A: All such kernel threads need to be fixed, one by one. Select the
-place where the thread is safe to be frozen (no kernel semaphores
-should be held at that point and it must be safe to sleep there), and
-add:
-
- try_to_freeze();
-
-If the thread is needed for writing the image to storage, you should
-instead set the PF_NOFREEZE process flag when creating the thread (and
-be very careful).
+Q: What is the freezing of tasks and why are we using it?
+A: The freezing of tasks is a mechanism by which user space processes and some
+kernel threads are controlled during hibernation or system-wide suspend (on some
+architectures). See freezing-of-tasks.txt for details.
Q: What is the difference between "platform" and "shutdown"?
diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index 4112afe712b9af2522cdea3728dc0b3acc5de9ca..47001d50a083da27f3b3a0151949ff262a0cad1e 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -222,6 +222,7 @@
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/kernel.h>
+#include <linux/freezer.h>
#include <linux/smp.h>
#include <linux/dmi.h>
#include <linux/suspend.h>
@@ -2311,7 +2312,6 @@ static int __init apm_init(void)
remove_proc_entry("apm", NULL);
return err;
}
- kapmd_task->flags |= PF_NOFREEZE;
wake_up_process(kapmd_task);
if (num_online_cpus() > 1 && !smp ) {
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 7f8b7af2b95fc89f8f638c264754fc4974566cf7..21db8f56c9a149df9a4d0954df3f28aa64900827 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -667,6 +667,7 @@ static int balanced_irq(void *unused)
set_pending_irq(i, cpumask_of_cpu(0));
}
+ set_freezable();
for ( ; ; ) {
time_remaining = schedule_timeout_interruptible(time_remaining);
try_to_freeze();
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 4503290da4078c2916bafdc8af301fac333f5349..06eaa11cbc2fdb6f298ef7cd88708adb2f059898 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -68,6 +68,7 @@
#include <linux/loop.h>
#include <linux/compat.h>
#include <linux/suspend.h>
+#include <linux/freezer.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h> /* for invalidate_bdev() */
#include <linux/completion.h>
@@ -600,13 +601,6 @@ static int loop_thread(void *data)
struct loop_device *lo = data;
struct bio *bio;
- /*
- * loop can be used in an encrypted device,
- * hence, it mustn't be stopped at all
- * because it could be indirectly used during suspension
- */
- current->flags |= PF_NOFREEZE;
-
set_user_nice(current, -20);
while (!kthread_should_stop() || lo->lo_bio) {
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 7c294a40002e26f1ac7f73741c2e3d836f7ae4a5..31be33e4f119d5238bdc283b99e2e534133ddd9f 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1593,6 +1593,7 @@ static int kcdrwd(void *foobar)
long min_sleep_time, residue;
set_user_nice(current, -20);
+ set_freezable();
for (;;) {
DECLARE_WAITQUEUE(wait, current);
diff --git a/drivers/char/apm-emulation.c b/drivers/char/apm-emulation.c
index 179c7a3b6e750390d1fad74211d3b5e8d42fec1d..ec116df919d97c043b45ed89637e73624d59810f 100644
--- a/drivers/char/apm-emulation.c
+++ b/drivers/char/apm-emulation.c
@@ -20,6 +20,7 @@
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/apm-emulation.h>
+#include <linux/freezer.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/list.h>
@@ -329,13 +330,8 @@ apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
/*
* Wait for the suspend/resume to complete. If there
* are pending acknowledges, we wait here for them.
- *
- * Note: we need to ensure that the PM subsystem does
- * not kick us out of the wait when it suspends the
- * threads.
*/
flags = current->flags;
- current->flags |= PF_NOFREEZE;
wait_event(apm_suspend_waitqueue,
as->suspend_state == SUSPEND_DONE);
@@ -365,13 +361,8 @@ apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg)
/*
* Wait for the suspend/resume to complete. If there
* are pending acknowledges, we wait here for them.
- *
- * Note: we need to ensure that the PM subsystem does
- * not kick us out of the wait when it suspends the
- * threads.
*/
flags = current->flags;
- current->flags |= PF_NOFREEZE;
wait_event_interruptible(apm_suspend_waitqueue,
as->suspend_state == SUSPEND_DONE);
@@ -598,7 +589,6 @@ static int __init apm_init(void)
kapmd_tsk = NULL;
return ret;
}
- kapmd_tsk->flags |= PF_NOFREEZE;
wake_up_process(kapmd_tsk);
#ifdef CONFIG_PROC_FS
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index b3ab42e0dd4af4599c32483c35cb104e8416fddb..83c1151ec7a21559257f3663a59d0f59e4d92abc 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -679,6 +679,7 @@ static int khvcd(void *unused)
int poll_mask;
struct hvc_struct *hp;
+ set_freezable();
__set_current_state(TASK_RUNNING);
do {
poll_mask = 0;
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 7b622300d0e58f2c4ef43fe4e6d99022688f2600..804875de5801bc0e35eafad59c8e0f7c1f1417ed 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -1906,6 +1906,7 @@ static void do_edac_check(void)
static int edac_kernel_thread(void *arg)
{
+ set_freezable();
while (!kthread_should_stop()) {
do_edac_check();
diff --git a/drivers/ieee1394/ieee1394_core.c b/drivers/ieee1394/ieee1394_core.c
index 0fc8c6e559e4a64d160bfbc0c7fcd4a04d8538e5..ee45259573c8b3c9450637e07047bb5f58ab9d2b 100644
--- a/drivers/ieee1394/ieee1394_core.c
+++ b/drivers/ieee1394/ieee1394_core.c
@@ -30,6 +30,7 @@
#include <linux/moduleparam.h>
#include <linux/bitops.h>
#include <linux/kdev_t.h>
+#include <linux/freezer.h>
#include <linux/suspend.h>
#include <linux/kthread.h>
#include <linux/preempt.h>
@@ -1128,8 +1129,6 @@ static int hpsbpkt_thread(void *__hi)
struct list_head tmp;
int may_schedule;
- current->flags |= PF_NOFREEZE;
-
while (!kthread_should_stop()) {
INIT_LIST_HEAD(&tmp);
diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index 51a12062ed368726530dd60b9fbbe43469ec8f4b..2ffd53461db6877eb6a108d90fca478a40387f12 100644
--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -1699,6 +1699,7 @@ static int nodemgr_host_thread(void *__hi)
unsigned int g, generation = 0;
int i, reset_cycles = 0;
+ set_freezable();
/* Setup our device-model entries */
nodemgr_create_host_dev_files(host);
diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index bd686a2a517decea484eb9739a7dfe206e781550..20896d5e5f0e640389161dbecde47c1d3b21992e 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -445,6 +445,7 @@ static struct gameport *gameport_get_pending_child(struct gameport *parent)
static int gameport_thread(void *nothing)
{
+ set_freezable();
do {
gameport_handle_event();
wait_event_interruptible(gameport_wait,
diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index a8f3bc1dff221ed00e0e2e513b0978a32f4a2779..372ca493119483006acb3deaae1cbbc7e7b0d920 100644
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -384,6 +384,7 @@ static struct serio *serio_get_pending_child(struct serio *parent)
static int serio_thread(void *nothing)
{
+ set_freezable();
do {
serio_handle_event();
wait_event_interruptible(serio_wait,
diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c
index f0cbcdb008edd424b06a845c292e500c803058d2..36f944019158af753cda9f4105fa9a85176c4c50 100644
--- a/drivers/input/touchscreen/ucb1400_ts.c
+++ b/drivers/input/touchscreen/ucb1400_ts.c
@@ -292,6 +292,7 @@ static int ucb1400_ts_thread(void *_ucb)
sched_setscheduler(tsk, SCHED_FIFO, ¶m);
+ set_freezable();
while (!kthread_should_stop()) {
unsigned int x, y, p;
long timeout;
diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index bd55e6ab99fc536164fe0c5b72a107fb6b6012f3..f25685b9b7cf51a782c24faaa86bf9b896e4acca 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -335,6 +335,7 @@ static int monitor_task(void *arg)
{
struct thermostat* th = arg;
+ set_freezable();
while(!kthread_should_stop()) {
try_to_freeze();
msleep_interruptible(2000);
diff --git a/drivers/macintosh/windfarm_core.c b/drivers/macintosh/windfarm_core.c
index 4fcb245ba184edd3d06684f4e2572b5571918212..e18d265d5d33206f437c00e6bf56a8afaf1a4cea 100644
--- a/drivers/macintosh/windfarm_core.c
+++ b/drivers/macintosh/windfarm_core.c
@@ -92,6 +92,7 @@ static int wf_thread_func(void *data)
DBG("wf: thread started\n");
+ set_freezable();
while(!kthread_should_stop()) {
if (time_after_eq(jiffies, next)) {
wf_notify(WF_EVENT_TICK, NULL);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 33beaa7da085cb487ed3ab47710dec048488df6b..9aefc4a023df810a79e7f934b5d2023b71cbad74 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4642,7 +4642,6 @@ static int md_thread(void * arg)
* many dirty RAID5 blocks.
*/
- current->flags |= PF_NOFREEZE;
allow_signal(SIGKILL);
while (!kthread_should_stop()) {
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index f4e4ca2dcaded8083ac6927ba4630636be374de5..b6c7f6610ec53205f407e8e2b85c397af3974155 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -523,6 +523,7 @@ static int dvb_frontend_thread(void *data)
dvb_frontend_init(fe);
+ set_freezable();
while (1) {
up(&fepriv->sem); /* is locked when we enter the thread... */
restart:
diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c
index 259ea08e784fdb53bd4edd4d94078b7a1a2f49c6..1cc2d286a1cbe2e04ef7dfdc701b63cc2cb33e58 100644
--- a/drivers/media/video/cx88/cx88-tvaudio.c
+++ b/drivers/media/video/cx88/cx88-tvaudio.c
@@ -906,6 +906,7 @@ int cx88_audio_thread(void *data)
u32 mode = 0;
dprintk("cx88: tvaudio thread started\n");
+ set_freezable();
for (;;) {
msleep_interruptible(1000);
if (kthread_should_stop())
diff --git a/drivers/media/video/msp3400-kthreads.c b/drivers/media/video/msp3400-kthreads.c
index e1821eb82fb5e271a263404fae8afcc4d03b79e0..d5ee2629121e93794b28680ecdc7b4e1e1eab106 100644
--- a/drivers/media/video/msp3400-kthreads.c
+++ b/drivers/media/video/msp3400-kthreads.c
@@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
+#include <linux/freezer.h>
#include <linux/videodev.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
@@ -468,6 +469,7 @@ int msp3400c_thread(void *data)
v4l_dbg(1, msp_debug, client, "msp3400 daemon started\n");
+ set_freezable();
for (;;) {
v4l_dbg(2, msp_debug, client, "msp3400 thread: sleep\n");
msp_sleep(state, -1);
@@ -646,7 +648,7 @@ int msp3410d_thread(void *data)
int val, i, std, count;
v4l_dbg(1, msp_debug, client, "msp3410 daemon started\n");
-
+ set_freezable();
for (;;) {
v4l_dbg(2, msp_debug, client, "msp3410 thread: sleep\n");
msp_sleep(state,-1);
@@ -940,7 +942,7 @@ int msp34xxg_thread(void *data)
int val, i;
v4l_dbg(1, msp_debug, client, "msp34xxg daemon started\n");
-
+ set_freezable();
for (;;) {
v4l_dbg(2, msp_debug, client, "msp34xxg thread: sleep\n");
msp_sleep(state, -1);
diff --git a/drivers/media/video/tvaudio.c b/drivers/media/video/tvaudio.c
index c9bf9dbc2ea3a5752b25cafe5324b24e0de19acc..9da338dc4f3b5830d50eeecd9a8ad4e6bee0fbbf 100644
--- a/drivers/media/video/tvaudio.c
+++ b/drivers/media/video/tvaudio.c
@@ -271,7 +271,7 @@ static int chip_thread(void *data)
struct CHIPDESC *desc = chiplist + chip->type;
v4l_dbg(1, debug, &chip->c, "%s: thread started\n", chip->c.name);
-
+ set_freezable();
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (!kthread_should_stop())
diff --git a/drivers/media/video/video-buf-dvb.c b/drivers/media/video/video-buf-dvb.c
index fcc5467e76364f982168b6d3d49077707a8edbde..e617925ba31e495c79b70e552eb5cc040871208f 100644
--- a/drivers/media/video/video-buf-dvb.c
+++ b/drivers/media/video/video-buf-dvb.c
@@ -47,6 +47,7 @@ static int videobuf_dvb_thread(void *data)
int err;
dprintk("dvb thread started\n");
+ set_freezable();
videobuf_read_start(&dvb->dvbq);
for (;;) {
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index f7e1d19103749edcb308ee25ff45505efc87e64d..3ef4d0159c3306fcbf7b0bf5b41803e1de7ebaa4 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -573,6 +573,7 @@ static int vivi_thread(void *data)
dprintk(1,"thread started\n");
mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
+ set_freezable();
for (;;) {
vivi_sleep(dma_q);
diff --git a/drivers/mfd/ucb1x00-ts.c b/drivers/mfd/ucb1x00-ts.c
index 38e815a2e87135227f16095607a2a588a38d6aab..fdbaa776f249f0eaec80a9c0fa21d11892057361 100644
--- a/drivers/mfd/ucb1x00-ts.c
+++ b/drivers/mfd/ucb1x00-ts.c
@@ -209,6 +209,7 @@ static int ucb1x00_thread(void *_ts)
DECLARE_WAITQUEUE(wait, tsk);
int valid = 0;
+ set_freezable();
add_wait_queue(&ts->irq_wait, &wait);
while (!kthread_should_stop()) {
unsigned int x, y, p;
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index 4fb2089dc6900cb1399496defcf8184b106cdbd0..b53dac8d1b694f8ebaa63f7119f3e760e90e3e40 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -11,6 +11,7 @@
*/
#include <linux/module.h>
#include <linux/blkdev.h>
+#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/mmc/card.h>
@@ -44,11 +45,7 @@ static int mmc_queue_thread(void *d)
struct mmc_queue *mq = d;
struct request_queue *q = mq->queue;
- /*
- * Set iothread to ensure that we aren't put to sleep by
- * the process freezing. We handle suspension ourselves.
- */
- current->flags |= PF_MEMALLOC|PF_NOFREEZE;
+ current->flags |= PF_MEMALLOC;
down(&mq->thread_sem);
do {
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 51bc7e2f1f22d61c735afc81b58f2f7ad35b777c..ef89780eb9d6d213ba186348a2f73304b3479428 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -16,6 +16,7 @@
#include <linux/mtd/mtd.h>
#include <linux/blkdev.h>
#include <linux/blkpg.h>
+#include <linux/freezer.h>
#include <linux/spinlock.h>
#include <linux/hdreg.h>
#include <linux/init.h>
@@ -80,7 +81,7 @@ static int mtd_blktrans_thread(void *arg)
struct request_queue *rq = tr->blkcore_priv->rq;
/* we might get involved when memory gets low, so use PF_MEMALLOC */
- current->flags |= PF_MEMALLOC | PF_NOFREEZE;
+ current->flags |= PF_MEMALLOC;
spin_lock_irq(rq->queue_lock);
while (!kthread_should_stop()) {
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 9ecaf77eca9ebd16cb1a761bab0aa2f9d63a5fbd..ab2174a56bc28b490089129b88c23e583eb7a1fa 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1346,6 +1346,7 @@ static int ubi_thread(void *u)
ubi_msg("background thread \"%s\" started, PID %d",
ubi->bgt_name, current->pid);
+ set_freezable();
for (;;) {
int err;
diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 1c54908fdc4ce68e7c4b7ee1b24534bcfad83f1f..ee1cc14db389f91d9c8a7d09898c1eee7887d494 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -3086,7 +3086,8 @@ static int airo_thread(void *data) {
struct net_device *dev = data;
struct airo_info *ai = dev->priv;
int locked;
-
+
+ set_freezable();
while(1) {
/* make swsusp happy with our thread */
try_to_freeze();
diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 4a59306a3f05feb9d7f31f4273bc3a549ff9cf3f..9f366242c392c6afe3e8518129028d89be76a0e4 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -613,6 +613,7 @@ static int wlan_service_main_thread(void *data)
init_waitqueue_entry(&wait, current);
+ set_freezable();
for (;;) {
lbs_deb_thread( "main-thread 111: intcounter=%d "
"currenttxskb=%p dnld_sent=%d\n",
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index 50cad3a59a6c236696276bfd2a160cd00d770c17..7c93a108f9b81f4c88ba67ae1a5f0686fc003b6a 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -651,6 +651,7 @@ static int pccardd(void *__skt)
add_wait_queue(&skt->thread_wait, &wait);
complete(&skt->thread_done);
+ set_freezable();
for (;;) {
unsigned long flags;
unsigned int events;
diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
index 3a201b77b963af5134d0578d2624451f8d8fa8c5..03baf1c64a2e04fa2307f37b504b3862e9837350 100644
--- a/drivers/pnp/pnpbios/core.c
+++ b/drivers/pnp/pnpbios/core.c
@@ -160,6 +160,7 @@ static int pnp_dock_thread(void * unused)
{
static struct pnp_docking_station_info now;
int docked = -1, d = 0;
+ set_freezable();
while (!unloading)
{
int status;
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index d70ddfda93fc968cd2d001f80f0a3c1487b32a8c..9c5342e7a69c6a7b9e6625d5d6c69e64b48c874c 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -40,6 +40,7 @@
#include <linux/err.h>
#include <linux/blkdev.h>
+#include <linux/freezer.h>
#include <linux/scatterlist.h>
/* ---------- SCSI Host glue ---------- */
@@ -868,8 +869,6 @@ static int sas_queue_thread(void *_sas_ha)
{
struct sas_ha_struct *sas_ha = _sas_ha;
- current->flags |= PF_NOFREEZE;
-
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
schedule();
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 9adb64ac054c68f869d83ede1b82d42edbdb4461..8a525abda30fcad2d7b5cf54dfab5b46bc067e68 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -19,6 +19,7 @@
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/kernel.h>
+#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
@@ -1516,8 +1517,6 @@ int scsi_error_handler(void *data)
{
struct Scsi_Host *shost = data;
- current->flags |= PF_NOFREEZE;
-
/*
* We use TASK_INTERRUPTIBLE so that the thread is not
* counted against the load average as a running process.
diff --git a/drivers/usb/atm/ueagle-atm.c b/drivers/usb/atm/ueagle-atm.c
index 4973e147bc79ea441e6a48875cfa00c60cc15d3a..8f046659b4e947990036968cc836bf69e8bc73e1 100644
--- a/drivers/usb/atm/ueagle-atm.c
+++ b/drivers/usb/atm/ueagle-atm.c
@@ -1168,6 +1168,7 @@ static int uea_kthread(void *data)
struct uea_softc *sc = data;
int ret = -EAGAIN;
+ set_freezable();
uea_enters(INS_TO_USBDEV(sc));
while (!kthread_should_stop()) {
if (ret < 0 || sc->reset)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 50e79010401cd42050062d52d1c1e9876cc0aa53..fd74c50b18049b71f85256fa47a62d6199bc2098 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2728,6 +2728,7 @@ loop:
static int hub_thread(void *__unused)
{
+ set_freezable();
do {
hub_events();
wait_event_interruptible(khubd_wait,
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 8712ef987179b2ca2ba4ed3c6d26df9823395ed9..be7a1bd2823b865ed777e0562ac774417057fa74 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -3434,6 +3434,9 @@ static int fsg_main_thread(void *fsg_)
allow_signal(SIGKILL);
allow_signal(SIGUSR1);
+ /* Allow the thread to be frozen */
+ set_freezable();
+
/* Arrange for userspace references to be interpreted as kernel
* pointers. That way we can pass a kernel pointer to a routine
* that expects a __user pointer and it will work okay. */
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index bef8bcd9bd9824fa428c6108a1010d6c2e5e479b..28842d208bb031738c8b68d79a6ac8ec91196fe7 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -311,8 +311,6 @@ static int usb_stor_control_thread(void * __us)
struct Scsi_Host *host = us_to_host(us);
int autopm_rc;
- current->flags |= PF_NOFREEZE;
-
for(;;) {
US_DEBUGP("*** thread sleeping.\n");
if(down_interruptible(&us->sema))
@@ -920,6 +918,7 @@ static int usb_stor_scan_thread(void * __us)
printk(KERN_DEBUG
"usb-storage: device found at %d\n", us->pusb_dev->devnum);
+ set_freezable();
/* Wait for the timeout to expire or for a disconnect */
if (delay_use > 0) {
printk(KERN_DEBUG "usb-storage: waiting for device "
diff --git a/drivers/video/ps3fb.c b/drivers/video/ps3fb.c
index 08b7ffbbbbd862dc14f9cc405d5288c9f3409fa3..3972aa8cf859051760c8f8be7b473217613c796d 100644
--- a/drivers/video/ps3fb.c
+++ b/drivers/video/ps3fb.c
@@ -812,6 +812,7 @@ static int ps3fb_ioctl(struct fb_info *info, unsigned int cmd,
static int ps3fbd(void *arg)
{
+ set_freezable();
while (!kthread_should_stop()) {
try_to_freeze();
set_current_state(TASK_INTERRUPTIBLE);
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index f5c5b760ed7b7d9554b7fc3a7f31ee9fc5b27a4c..c6332108f1c5ba429105f31a54ceeacb05567ad7 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -805,6 +805,7 @@ static int w1_control(void *data)
struct w1_master *dev, *n;
int have_to_wait = 0;
+ set_freezable();
while (!kthread_should_stop() || have_to_wait) {
have_to_wait = 0;
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 8b0cbf4a4ad0aa33dfecf6100afeb139151e5b03..bd0f2f2353ce3eda3be4aab2d21518cd58671154 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -849,6 +849,7 @@ static int cifs_oplock_thread(void * dummyarg)
__u16 netfid;
int rc;
+ set_freezable();
do {
if (try_to_freeze())
continue;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index f4e92661b22306ffa1d019f81a47e501fc374a04..0a1b8bd1dfcbcf113274107b6ea3bb491bd03cd3 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -363,6 +363,7 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
GFP_KERNEL);
}
+ set_freezable();
while (!kthread_should_stop()) {
if (try_to_freeze())
continue;
diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index 0c82dfcfd246b21215a42b78b44484053e4eecc4..143c5530caf35ab48446cc3fbe38c6ace0fac41d 100644
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -81,6 +81,7 @@ static int jffs2_garbage_collect_thread(void *_c)
set_user_nice(current, 10);
+ set_freezable();
for (;;) {
allow_signal(SIGHUP);
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 26809325469cdc73bafa76dec33e52cfa046f548..9fcdef50aad6793ccadb8680b44c2c826e1706a3 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -25,6 +25,7 @@
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/mutex.h>
+#include <linux/freezer.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/stats.h>
@@ -119,6 +120,7 @@ lockd(struct svc_rqst *rqstp)
complete(&lockd_start_done);
daemonize("lockd");
+ set_freezable();
/* Process request with signals blocked, but allow SIGKILL. */
allow_signal(SIGKILL);
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 75f309c8741a066ff8c7b8443452a4b8d98b8740..a796be5051bfa4886254f7bd40a9cb4f7ff4f7de 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -14,6 +14,7 @@
#include <linux/sunrpc/svcsock.h>
#include <linux/nfs_fs.h>
#include <linux/mutex.h>
+#include <linux/freezer.h>
#include <net/inet_sock.h>
@@ -67,6 +68,7 @@ static void nfs_callback_svc(struct svc_rqst *rqstp)
daemonize("nfsv4-svc");
/* Process request with signals blocked, but allow SIGKILL. */
allow_signal(SIGKILL);
+ set_freezable();
complete(&nfs_callback_info.started);
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index ff55950efb437446e1acc7b42a2dd43c9fcc2f71..5c8192bcbced40447bd291845591beeec8677628 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
+#include <linux/freezer.h>
#include <linux/fs_struct.h>
#include <linux/sunrpc/types.h>
@@ -432,6 +433,7 @@ nfsd(struct svc_rqst *rqstp)
* dirty pages.
*/
current->flags |= PF_LESS_THROTTLE;
+ set_freezable();
/*
* The main request loop
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 06894cf00b129dfd7dd3d146213387ffa20bb082..4528f9a3f304d5e923fa09458bd6aacfd04161c2 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -562,6 +562,7 @@ xfssyncd(
bhv_vfs_sync_work_t *work, *n;
LIST_HEAD (tmp);
+ set_freezable();
timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10);
for (;;) {
timeleft = schedule_timeout_interruptible(timeleft);
diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 4631086f50603d56050efcc001548cf44fc21e43..2d38b1a7466251bded8a45d01d41cca577cf40b1 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -1,5 +1,8 @@
/* Freezer declarations */
+#ifndef FREEZER_H_INCLUDED
+#define FREEZER_H_INCLUDED
+
#include <linux/sched.h>
#ifdef CONFIG_PM
@@ -115,6 +118,14 @@ static inline int freezer_should_skip(struct task_struct *p)
return !!(p->flags & PF_FREEZER_SKIP);
}
+/*
+ * Tell the freezer that the current task should be frozen by it
+ */
+static inline void set_freezable(void)
+{
+ current->flags &= ~PF_NOFREEZE;
+}
+
#else
static inline int frozen(struct task_struct *p) { return 0; }
static inline int freezing(struct task_struct *p) { return 0; }
@@ -130,4 +141,7 @@ static inline int try_to_freeze(void) { return 0; }
static inline void freezer_do_not_count(void) {}
static inline void freezer_count(void) {}
static inline int freezer_should_skip(struct task_struct *p) { return 0; }
+static inline void set_freezable(void) {}
#endif
+
+#endif /* FREEZER_H_INCLUDED */
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index b222ce9e1c8bd3e4871acf564d187225ba0e574c..a6b4c0c08e13ea4bc1db5ade1cf8eb73d18c7d72 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -56,12 +56,9 @@ static void __init handle_initrd(void)
sys_chroot(".");
pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
- if (pid > 0) {
- while (pid != sys_wait4(-1, NULL, 0, NULL)) {
- try_to_freeze();
+ if (pid > 0)
+ while (pid != sys_wait4(-1, NULL, 0, NULL))
yield();
- }
- }
/* move initrd to rootfs' /old */
sys_fchdir(old_fd);
diff --git a/kernel/audit.c b/kernel/audit.c
index 5ce8851facf7d61a6a45b0254866f388d8af5e55..eb0f9165b401bcf4375baf4b233ab6a1401b448d 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -392,6 +392,7 @@ static int kauditd_thread(void *dummy)
{
struct sk_buff *skb;
+ set_freezable();
while (!kthread_should_stop()) {
skb = skb_dequeue(&audit_skb_queue);
wake_up(&audit_backlog_wait);
diff --git a/kernel/exit.c b/kernel/exit.c
index 57626692cd90202a08ad86b032f432bf543f7a21..e8af8d0c2483232248ba163dc0e9eb03ad6ed504 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -31,6 +31,7 @@
#include <linux/mempolicy.h>
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
+#include <linux/freezer.h>
#include <linux/cpuset.h>
#include <linux/syscalls.h>
#include <linux/signal.h>
@@ -387,6 +388,11 @@ void daemonize(const char *name, ...)
* they would be locked into memory.
*/
exit_mm(current);
+ /*
+ * We don't want to have TIF_FREEZE set if the system-wide hibernation
+ * or suspend transition begins right now.
+ */
+ current->flags |= PF_NOFREEZE;
set_special_pids(1, 1);
proc_clear_tty(current);
diff --git a/kernel/fork.c b/kernel/fork.c
index 7c5c5888e00a99d8b33bf59c4fe5056ebc905f81..ba39bdb2a7b8be3a8b6e01a4421e34969464d3cf 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -923,7 +923,7 @@ static inline void copy_flags(unsigned long clone_flags, struct task_struct *p)
{
unsigned long new_flags = p->flags;
- new_flags &= ~(PF_SUPERPRIV | PF_NOFREEZE);
+ new_flags &= ~PF_SUPERPRIV;
new_flags |= PF_FORKNOEXEC;
if (!(clone_flags & CLONE_PTRACE))
p->ptrace = 0;
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 55ba82a85a66c65605994ec685a2ce1918efdfc9..ddff33247785aa95a95f00356f9909dde2ff3196 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -40,6 +40,7 @@
#include <linux/moduleparam.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
+#include <linux/freezer.h>
#include <linux/cpu.h>
#include <linux/random.h>
#include <linux/delay.h>
@@ -518,7 +519,6 @@ rcu_torture_writer(void *arg)
VERBOSE_PRINTK_STRING("rcu_torture_writer task started");
set_user_nice(current, 19);
- current->flags |= PF_NOFREEZE;
do {
schedule_timeout_uninterruptible(1);
@@ -558,7 +558,6 @@ rcu_torture_fakewriter(void *arg)
VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started");
set_user_nice(current, 19);
- current->flags |= PF_NOFREEZE;
do {
schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10);
@@ -589,7 +588,6 @@ rcu_torture_reader(void *arg)
VERBOSE_PRINTK_STRING("rcu_torture_reader task started");
set_user_nice(current, 19);
- current->flags |= PF_NOFREEZE;
do {
idx = cur_ops->readlock();
diff --git a/kernel/rtmutex-tester.c b/kernel/rtmutex-tester.c
index 015fc633c96c7338f8ffb3e01cc1ce3a17e72030..e3055ba6915978c4290492ef16cacb3f3a844c61 100644
--- a/kernel/rtmutex-tester.c
+++ b/kernel/rtmutex-tester.c
@@ -260,6 +260,7 @@ static int test_func(void *data)
int ret;
current->flags |= PF_MUTEX_TESTER;
+ set_freezable();
allow_signal(SIGHUP);
for(;;) {
diff --git a/kernel/sched.c b/kernel/sched.c
index 1c8076676eb1c99bb3ea325a4ac10b18a2caeeee..cb31fb4a1379e23b0628795d5e1bfd64c6031bf0 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4912,8 +4912,6 @@ static int migration_thread(void *data)
struct migration_req *req;
struct list_head *head;
- try_to_freeze();
-
spin_lock_irq(&rq->lock);
if (cpu_is_offline(cpu)) {
@@ -5147,7 +5145,6 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
p = kthread_create(migration_thread, hcpu, "migration/%d", cpu);
if (IS_ERR(p))
return NOTIFY_BAD;
- p->flags |= PF_NOFREEZE;
kthread_bind(p, cpu);
/* Must be high prio: stop_machine expects to yield to it. */
rq = task_rq_lock(p, &flags);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 8de267790166fe1c062dabaae066c578829e6dba..0f546ddea43df41debcf42507ede2ac6873c80a9 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -14,6 +14,7 @@
#include <linux/notifier.h>
#include <linux/percpu.h>
#include <linux/cpu.h>
+#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/rcupdate.h>
#include <linux/smp.h>
@@ -488,8 +489,6 @@ void __init softirq_init(void)
static int ksoftirqd(void * __bind_cpu)
{
- current->flags |= PF_NOFREEZE;
-
set_current_state(TASK_INTERRUPTIBLE);
while (!kthread_should_stop()) {
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 0131e296ffb416435f7c54a935657c624a09d0c5..708d4882c0c391bffa47a24ae0153bccabd0a1c7 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -10,6 +10,7 @@
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/delay.h>
+#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/notifier.h>
#include <linux/module.h>
@@ -116,7 +117,6 @@ static int watchdog(void * __bind_cpu)
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
sched_setscheduler(current, SCHED_FIFO, ¶m);
- current->flags |= PF_NOFREEZE;
/* initialize timestamp */
touch_softlockup_watchdog();
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index d7d3fa3072e5941c7fc5d5757963b011823b93d5..1935302cc645d22dcbe1403085fe623382645190 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -282,8 +282,8 @@ static int worker_thread(void *__cwq)
struct cpu_workqueue_struct *cwq = __cwq;
DEFINE_WAIT(wait);
- if (!cwq->wq->freezeable)
- current->flags |= PF_NOFREEZE;
+ if (cwq->wq->freezeable)
+ set_freezable();
set_user_nice(current, -5);
diff --git a/mm/pdflush.c b/mm/pdflush.c
index 8ce0900dc95ce13052ee6241f7cf6de91f828a8a..8f6ee073c0e3f44a14a40fe1351006b1246e4523 100644
--- a/mm/pdflush.c
+++ b/mm/pdflush.c
@@ -92,6 +92,7 @@ struct pdflush_work {
static int __pdflush(struct pdflush_work *my_work)
{
current->flags |= PF_FLUSHER | PF_SWAPWRITE;
+ set_freezable();
my_work->fn = NULL;
my_work->who = current;
INIT_LIST_HEAD(&my_work->list);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2225b7c9df8582cb8713281192c81d9b6d49e20c..d419e10e3daa2dea26c6da35fb8e418b27629c6f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1421,6 +1421,7 @@ static int kswapd(void *p)
* trying to free the first piece of memory in the first place).
*/
tsk->flags |= PF_MEMALLOC | PF_SWAPWRITE | PF_KSWAPD;
+ set_freezable();
order = 0;
for ( ; ; ) {
diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index 1c8f4a0c5f4356dc9421bcc90dadc5efbc91c44c..1f78c3e336d8cb460cfeb70ec5f7f053e20bddf7 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -36,6 +36,7 @@
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/wait.h>
+#include <linux/freezer.h>
#include <linux/errno.h>
#include <linux/net.h>
#include <net/sock.h>
@@ -474,7 +475,6 @@ static int bnep_session(void *arg)
daemonize("kbnepd %s", dev->name);
set_user_nice(current, -15);
- current->flags |= PF_NOFREEZE;
init_waitqueue_entry(&wait, current);
add_wait_queue(sk->sk_sleep, &wait);
diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c
index 66bef1ccee2a41fcce9cee029729c28f89429546..ca60a4517fd34c86061f99a7a6bde51cfef35b44 100644
--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -29,6 +29,7 @@
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
+#include <linux/freezer.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/ioctl.h>
@@ -287,7 +288,6 @@ static int cmtp_session(void *arg)
daemonize("kcmtpd_ctr_%d", session->num);
set_user_nice(current, -15);
- current->flags |= PF_NOFREEZE;
init_waitqueue_entry(&wait, current);
add_wait_queue(sk->sk_sleep, &wait);
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 450eb0244bbf6080b24142b4c9686bce948cf2fe..64d89ca2884796ab29365f1ad2b40cebf35a136c 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -28,6 +28,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
+#include <linux/freezer.h>
#include <linux/fcntl.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
@@ -547,7 +548,6 @@ static int hidp_session(void *arg)
daemonize("khidpd_%04x%04x", vendor, product);
set_user_nice(current, -15);
- current->flags |= PF_NOFREEZE;
init_waitqueue_entry(&ctrl_wait, current);
init_waitqueue_entry(&intr_wait, current);
diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index 52e04df323eaa61eebb326659bf84c2db0cc52a8..bb7220770f2c671c879cca9aecdb3404021323a4 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -33,6 +33,7 @@
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/init.h>
+#include <linux/freezer.h>
#include <linux/wait.h>
#include <linux/device.h>
#include <linux/net.h>
@@ -1940,7 +1941,6 @@ static int rfcomm_run(void *unused)
daemonize("krfcommd");
set_user_nice(current, -10);
- current->flags |= PF_NOFREEZE;
BT_DBG("");
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 75215331b0457b122088f91d8f4d67d4382d27dc..bca787fdbc51ae9fe77e576ffee89c3f7770faca 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3465,6 +3465,8 @@ static int pktgen_thread_worker(void *arg)
set_current_state(TASK_INTERRUPTIBLE);
+ set_freezable();
+
while (!kthread_should_stop()) {
pkt_dev = next_to_run(t);